Aggiunge monitoraggio ops: health check, log scanner, dashboard e notifiche.

Introduce incidenti con dedup, job Sidekiq ogni 3 min, scan log cron, /up/deep,
dashboard /admin/ops e push ntfy; include Sentry opzionale e fix test suite.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/controllers/admin/ops_controller.rb

@@ -0,0 +1,37 @@
+module Admin
+  class OpsController < Admin::BaseController
+    def index
+      @open_incidents = Ops::Incident.open.recent.limit(50)
+      @resolved_incidents = Ops::Incident.where(status: "resolved").since(30.days.ago).recent.limit(30)
+      @summary = ops_summary
+    end
+
+    def acknowledge
+      incident = Ops::Incident.find(params[:id])
+      incident.acknowledge!
+      redirect_to admin_ops_path, notice: "Incidente preso in carico"
+    end
+
+    def resolve
+      incident = Ops::Incident.find(params[:id])
+      incident.resolve!
+      redirect_to admin_ops_path, notice: "Incidente risolto"
+    end
+
+    def mute
+      incident = Ops::Incident.find(params[:id])
+      incident.mute!(duration: 24.hours)
+      redirect_to admin_ops_path, notice: "Notifiche sospese per 24 ore"
+    end
+
+    private
+
+    def ops_summary
+      {
+        open_critical: Ops::Incident.critical_open.count,
+        open_warning: Ops::Incident.open.where(severity: "warning").count,
+        open_total: Ops::Incident.open.count
+      }
+    end
+  end
+end